MSD 7330 7AL-3 Ignition Control Installation - Manual (Page 2)

2 INSTALLATION INSTRUCTIONS
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WIRING
Wiring the 7AL-3 will be simple by following the instructions. There are several color coded wires
supplied with the 7AL-3 and should be used as noted to avoid confusion or wrong connections. This
section is also broken down into two sections; Primary Wiring and Optional Wiring.
• The Primary section designates the wires that must be connected to run the engine.
• The Optional Wiring section explains the wiring of optional built-in features such as the Rev Controls,
RPM Activated Switch and Retard Controls. This information starts on page 6.
WARNING: The 7AL-3 produces very high voltages. Never short the battery or coil terminals. Use
caution during installation and while working near the ignition.
PRIMARY WIRING
1. Begin wiring the MSD by connecting the wires responsible to run the engine. The terminal strip on
the left side of the box is responsible for the Power Leads and the Coil Wires. Connect the supplied
wires as follows:
Heavy Red: Connect from the “Batt +” terminal directly to the battery positive (+) terminal.
Heavy Black: Connect from the “Batt -” terminal directly to the battery negative (-) terminal.
Orange: Connect from the “Coil +” terminal to the positive terminal (+) of the coil (570V).
Black: Connect from the “Coil -” terminal to the negative terminal (-) of the coil (Ground).
2. Move to the middle terminal strip and locate the terminal marked “Ignition”. Use the supplied RED
wire and connect it to a switched 12 volt source (ignition switch).
3. If a retard function is not going to be used the supplied "zero" degree module must be installed.
See the Multi-Step Retard Section.
4. The three terminals on the bottom of the middle terminal strip receive the trigger signal from the
distributor. One terminal is for points style applications and the other two are for use with a magnetic
pickup trigger, such as an MSD Billet Distributor or Crank Trigger.
Note: The Points and Mag Pickup terminals will never be connected at the same time.
Points: If you are using a Points style distributor or electronic amplifier, only the “Points” terminal
will be used. Connect the supplied WHITE wire from the points output in the distributor to the “Pnts”
terminal (Figure 1).
Magnetic Pickup: If you are using an MSD Distributor or Crank Trigger, only the Magnetic Pickup
terminals will be used. Locate the supplied harness with a VIOLET and GREEN wire with a 2-pin
connector on one end. Connect the VIOLET wire to the
“Mag +” terminal and the GREEN wire to the “Mag -”
terminal then connect the 2-pin connector to the Distributor
(Figure 1).
Magnetic Pickup Polarity
The MSD 7AL-3 can be used with other magnetic pick-up
distributors as long as the wires are connected correctly.
The chart on the right shows the polarity of some common
magnetic pickups.
Common Mag Pickup Wires
Distributor Colors
Mag+ Mag-
MSD Org/Blk Vio/Blk
MSD Crank Trigger Violet Green
Ford Orange Purple
Accel 46/48000 Series Org/Blk Vio/Blk
Accel 51/61000 Series Red Black
Chrysler Org/Wht Black
Mallory Org/Blk Vio/Blk
Figure 1